Added TicTacToe in Samples

Here's just one more sample — a tic tac toe game! 

It runs easily with `jruby -J-XstartOnFirstThread shoes4/bin/ruby-shoes shoes4/samples/simple-tictactoe.rb`.
Feels like there's a helper method here for looking if a row is matching so we don't have to repeat the `select`, the `{ ... }` block and the `> 2` check repeatedly. If we go with classes like I proposed, this method could probably be on the `Board` class which holds onto multiple `Tic`'s.